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Old 09-09-2015, 07:03 PM   #1
Scooby Newbie
Member#: 121226
Join Date: Jul 2006
Location: Texas
2004 Impreza WRX
Rally Blue

Default Diagnosing Whine b/w 60 and 70 mph

I have a 2004 WRX, stage 2 - owned it since new.

It has had a loud whine between 60 and 70 mph for a number of years, but has recently gotten louder. It only whines when on the throttle, but not on decel or when the clutch is pushed in.

I have replaced the center diff carrier bearings, but to no avail.

I was trying to troubleshoot this today by running the car on jackstands and listening. I noticed that as the wheels were coming up to speed in 1st/2nd gears, there was a lot of clunking/shaking going on. Is this typical for those of you that have run your car in the air?

The weirdest thing I saw was that three wheels rotated at the same speed, while the other was much slower. There was enough speed difference that it illuminated the ABS light. The rear wheels and the driver front wheel rotated at the same speed, but the passenger front was much slower.

I could see this happening if there was a lot more resistance on the passenger front wheel than the driver front wheel, but when rotating by hand they felt the same. I don't think that a caliper is dragging or that the wheel bearing is bad.

I only got up to around 30 mph on the speedometer since it seemed like funny things were happening. I know the front diff is open, but seems like the front two wheels should spin about the same speed with about the same resistance.

Any thoughts? Thanks.
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